[Date Index]
[Thread Index]
[Author Index]
Re: Expansion symbolic
*To*: mathgroup at smc.vnet.net
*Subject*: [mg74754] Re: Expansion symbolic
*From*: "Dominic Jackson" <dr.kjackson at gmail.com>
*Date*: Wed, 4 Apr 2007 03:54:52 -0400 (EDT)
Could anyone please tell me how to instruct Mathematica to expand the
expression below with respect to the powers of x. I would like the
constants c1,c2,c3 and c4 to stay behind the summation sign but the powers
of x to cross over to multiply x^(k+i).
(c1 (x^2) +c2 (x^3))* D[(Summation sign i=0 to infinity) Subscript[a,i+1][k]
* x^(k+i),{x,2}]//Expand.
This is what I get
c1 x^2 *(Summation sign i=0 to infinity) (k+i)*(k+i-1) *Subscript[a,i+1][k]
* x^(k+i-2)
+ c2 x^3 *(Summation sign i=0 to infinity) (k+i)*(k+i-1)
*Subscript[a,i+1][k] * x^(k+i-2)
And this is what I want to achieve.
c1 *(Summation sign i=0 to infinity) (k+i)*(k+i-1) *Subscript[a,i+1][k] *
x^(k+i)
+ c2 *(Summation sign i=0 to infinity) (k+i)*(k+i-1) *Subscript[a,i+1][k] *
x^(k+i+1)
Any clues.
Thanx.
Dom
Prev by Date:
**how to get the area of circles**
Next by Date:
**Re: Depurating tool**
Previous by thread:
**Re: how to get the area of circles**
Next by thread:
**Re: Expansion symbolic**
| |